Cressida (moon)
- There is also an asteroid called 548 Kressida.
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|
| Discovery | |
|---|---|
| Discovered by | Stephen P. Synnott / Voyager 2 |
| Discovery date | January 9, 1986 |
| Orbital characteristics | |
|
Mean orbit radius
|
61,766.730 ± 0.046 km[1] |
| Eccentricity | 0.00036 ± 0.00011[1] |
| 0.463569601 ± 0.000000013 d[1] | |
| Inclination | 0.006 ± 0.040° (to Uranus' equator)[1] |
| Satellite of | Uranus |
| Physical characteristics | |
| Dimensions | 92 × 74 × 74 km[2] |
|
Mean radius
|
39.8 ± 2 km[2][3][4] |
| ~20,000 km²[lower-alpha 1] | |
| Volume | ~260,000 km³[lower-alpha 1] |
| Mass | ~3.4×1017 kg[lower-alpha 1] |
|
Mean density
|
~1.3 g/cm³ (assumed)[3] |
| ~0.013 m/s2[lower-alpha 1] | |
| ~0.034 km/s[lower-alpha 1] | |
| synchronous[2] | |
| zero[2] | |
| Albedo | <templatestyles src="Plainlist/styles.css"/> |
| Temperature | ~64 K[lower-alpha 1] |
| <templatestyles src="Reflist/styles.css" />
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Cressida (/ˈkrɛsᵻdə/ KRES-i-də, Greek: Χρησίδα) is an inner satellite of Uranus. It was discovered from the images taken by Voyager 2 on 9 January 1986, and was given the temporary designation S/1986 U 3.[6] It was named after Cressida, the Trojan daughter of Calchas, a tragic heroine who appears in William Shakespeare's play Troilus and Cressida (as well as in tales by Geoffrey Chaucer and others). It is also designated Uranus IX.[7]
Cressida belongs to the Portia Group of satellites, which includes Bianca, Desdemona, Juliet, Portia, Rosalind, Cupid, Belinda and Perdita.[5] These satellites have similar orbits and photometric properties.[5] Other than its orbit,[1] radius of 41 km[2] and geometric albedo of 0.08,[5] virtually nothing is known about it.
In the Voyager 2 images Cressida appears as an elongated object, its major axis pointing towards Uranus. The ratio of axes of Cressida's prolate spheroid is 0.8 ± 0.3.[2] Its surface is grey in color.[2]
Cressida may collide with Desdemona within the next 100 million years.[8]
See also
References
Explanatory notes
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